I would really feel like an ass if adjusting the windage would be the fix. That was the first thing I did but even with the rear sight dialed all the way the point of impact was still far to the left. I took off the upper, clamped it, aligned the sights on the target and looked through the barrel and saw my target smack in the centre. That is why I suspect I get a lateral left spin on the bbs from the hopup. What I didn't understand is why do I still have the same deviation with the hopup entirely off. I guess I'll just upgrade the hopup, maybe the barrel too.